Ok, I've opened https://ghc.haskell.org/trac/ghc/ticket/9909
I won't be able to repro on HEAD in the near future, I'm afraid. Many thanks, On 19 December 2014 at 21:32, Edward Z. Yang <[email protected]> wrote: > Sounds like a bug. File a ticket? If you can see if you can > repro on GHC HEAD that would also be helpful. > > Edward > > Excerpts from David Turner's message of 2014-12-19 16:24:25 -0500: >> Hi, >> >> I'm getting the following error message when compiling a Yesod >> application (which uses Template Haskell rather a lot) with -fhpc: >> >> /usr/bin/ld: ./Foundation.dyn_o: relocation R_X86_64_PC32 against >> undefined symbol `_hpc_tickboxes_Settings_hpc' can not be used when >> making a shared object; recompile with -fPIC >> >> Steps to reproduce: >> >> 1. Run 'yesod init' to make a new scaffold. Call it 'testsite' and >> select 'simple' for no database. >> 2. Run: >> >> cd testsite >> sed Settings.hs -i -e 's/staticRoot conf.*/staticRoot conf = "foo"/' # >> GHC doesn't like this line >> ghc --make app/main.hs -XTemplateHaskell -XCPP -XOverloadedStrings >> -XMultiParamTypeClasses -XTypeFamilies -fhpc -O1 >> >> Running the ghc line again completes successfully. >> >> It seems that there is a missing ./Settings.dyn_o in the gcc command >> line that ghc calls, the first time through. It's there the second >> time so the link succeeds. No idea what that might mean. >> >> It's not a problem at -O0. >> >> I'm using 7.8.3 so this might be fixed now. >> >> Not sure what else might help! Any advice gratefully received. >> >> Cheers, >> >> David _______________________________________________ ghc-devs mailing list [email protected] http://www.haskell.org/mailman/listinfo/ghc-devs
